Which of the following does the root mega mean in

The root "mega" means "large" or "great" in various words. Some examples include:

1. Megaphone: A device that amplifies sound, typically used to project a person's voice.
2. Megalith: A large stone monument or structure, usually of historical or archaeological significance.
3. Megabyte: A unit of digital information consisting of 1,048,576 bytes (or 2^20 bytes).
4. Megalomania: A psychological disorder characterized by delusions of greatness, power, or importance.
5. Megafauna: Refers to large or giant animals that lived in the past or currently exist, such as elephants, mammoths, or whales.
6. Megalopolis: A region comprising several large cities and their surrounding areas, forming an interconnected urban network.

Note: There may be other words containing the root "mega" with different meanings or connotations.